Japan’s Naomi Osaka, a four-time Grand Slam singles champion, will work with Polish coach Tomasz Wiktorowski on a trial basis ...

Japan's Naomi Osaka, a four-time Grand Slam singles champion, will work with Polish coach Tomasz Wiktorowski on a trial basis after splitting with Patrick Mouratoglou after less than a year together.

Naomi Osaka is reshuffling her coaching team, parting ways with Patrick Mouratoglou and eyeing a fresh start with coach ...